I don’t know how that happened.  My 12” DeWalt miter saw is accurate and square.  The stamped steel indexing is inherently more accurate than the as-cast detents in other saws I looked at at the time I made my purchase.  I did not look at a Festool chop saw.  How are they indexing the angles?

The Kapex REB is a 12" miter saw.

Oops. Sorry, I thought you were referring to the cutting depth.

Which one has a 12" blade?  The only ones I have found have a 10.25" blade. With my concern about losing 2 vertical inches to the makita, I would love to look at the 12" blade if there is one.

The Kapex 120 uses indeed a 260 mm blade. However it has a special mode for cutting crown moldings and other pieces which one wants/needs to place vertically to the fence. This allows up to 120 mm (4^3/4") high cuts with the saw operating in a "chop saw" mode for this.

This allows it to "compete with" 12" saws for the casual carpentry tasks.

This is also the distinction of the KAPEX 88 in Europe which does not have this "special" mode and is cheaper by it. From the name, the full-depth cutting capacity is 88 x 305 mm aka 3^1/2" x 12". The 12" may come also from that in some places.

Check the comprehensive table under "technical data" on festool.com, the cut possibilities are described way better than the US site:
https://www.festool.com/products/semi-stationary-work/sliding-compound-mitre-saws/575302---ks-120-reb#Usage


To not repeat what was written here ofver KAPEX counless times, your best bet is to check out some Youtube videos from Peter Parfit and the likes to get a bit better glimpse of what the saw is about.

I advise *against* comparison videos with other makes as they mostly focus on raw performance which is not a metric KAPEX is aimed at - i.e. those comparisons make little sense. If one needs a good-enough carpentry slider, one should not look at KAPEX to begin. And when one looks for accuracy, those carpentry-focused comparisons are a waste of time at best while misleading at worst.

EDIT: link to festool.com with details of cut capacity

If portability is not a concern the Makita is a good choice. But it’s 70lbs.

I went from dewalt to the kapex and have no regrets. However I don’t consider it to be more accurate necessarily than my previous saw. I don’t miss the vertical cut capacity or having a 12” blade. The dust control is underwhelming but better than average for sure. My favourite features of the saw are the compactness, I also really like the handle. Best part for sure thought is the integrated stand which I really think sets the tool apart from anything else on the market


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I have a 12" Dewalt, which I'm fairly happy with aside from it being really heavy.  I switched stands to one that the saw detaches from; which at least makes the two pieces around 50-60lbs; together it was over 100lbs which was really tough getting into and out of my truck if I'm working away from home on a rental or another house.

I'm a DIYer, so don't use these every day; but I can get much better results with a vertical cut on my Dewalt or older non-sliding saw because I'm not fighting gravity to get the precise angle I want.  I upgraded to the 12" slider from a 10" fixed model to handle the 5 1/4" base that I put in my house, the Kapex wouldn't cut that vertically so I went with the Dewalt.

Later on, I've seen the Kapex has an adjustment knob for the compound angle, which looks like it should make it easier to get good results on the flat.  That might make the vertical cut height less important for you; but someone who has the Kapex might be able to chime in if they find that to be the case.

No issues with my Dewalt miter saw.
I read so many issues with Festool Kapex.

Please do note that people have different standards.
One expects .. more from a $1500 saw than from a $800 one.

Case in point:
When I bought my Makita LS 1040 10" chopsaw (non-slider) I DID NOT expect:
 - the fence to be straight => it is not, there is about 0.1" bend in the vertical fence, the bed is 0.05" lower than the cast "wings" ..
 - the saw to be smooth => it is not, the saw motor "starting" is jerky enough to move an unclamped piece ..

Yet, I cannot complain.
Both are non-issues at €250 for the saw. Would I accept such from a €1500 one? Nope!

People will "complain" about a 0.02" deviation from the KAPEX and spend days trying to calibrate-it-out. The same people would accept cuts that are 0.05" off as "OK" from a Dewalt or a Makita slider.

..
One can read a lot more owner complains about the serviceability of a $ 100k BMW than about a $ 30k Volkswagen. Guess which is a better car to drive.